Before each measurement, all parts of the apparatus
were thoroughly evacuated. After being filled with around
10 mL of the desired substance, the equilibrium cell was
connected to the Whitey ball valve (a constant-volume
valve) using a Cajon Ultra-Torr glass-metal connection.
Degassing was performed by freezing the cell content with
liquid nitrogen and melting it at room temperature under
moderate vacuum (about 50 kPa)